if (document.images) {
  
  // Curric BTN
  var curricon = new Image(); // for the active image
  curricon.src = "images/curric_btn_over.png";
  var curricoff = new Image(); // for the inactive image
  curricoff.src = "images/curric_btn.png";
  
  // Reading BTN
  var readon = new Image(); // for the active image
  readon.src = "images/reading_btn_over.png";
  var readoff = new Image(); // for the inactive image
  readoff.src = "images/reading_btn.png";
  
  // Elem Math BTN
  var elemon = new Image(); // for the active image
  elemon.src = "images/elem_math_btn_over.png";
  var elemoff = new Image(); // for the inactive image
  elemoff.src = "images/elem_math_btn.png";
  
  // Mid Math BTN
  var middleon = new Image(); // for the active image
  middleon.src = "images/middle_math_btn_over.png";
  var middleoff = new Image(); // for the inactive image
  middleoff.src = "images/middle_math_btn.png";
}

function changeImage(picName, imgName) {
  
  if (document.images)
  {
    imgOn=eval(imgName + ".src");
	document[picName].src = imgOn;
  }
}

function pulldown(state) {
	if(state) { 
		if (typeof(closer) != 'undefined') {
			clearTimeout(closer);
		}
		document.getElementById('progmenu').style.display = 'block';
	}
	else {
		//document.getElementById('progmenu').style.display = 'none';
		closer = setTimeout("document.getElementById('progmenu').style.display = 'none'", 200);
	}
}